The leaders of the Conservative, Liberal Democrats, Labour and the Green party are attending the televised Sky News, Facebook Stand Up Be Counted event with questions being asked by a studio audience of people aged 16 to 25 as well through Sky News' Facebook pages.

The Green Party: Natalie Bennett

The Green Party's leader Natalie Bennett was the first to face the questions. She discussed feminism, immigration, and terrorism. She said that membership of a terrorist party should be a criminal offence, which contrasts with her stance on the issue a week ago.

"Obviously [Islamic State] and al-Qaeda are hideous terrorist organisations that advocate and support violence. If you are involved in them, support them in any way, then you are participating in inciting violence, that’s a crime, rightly, and should be pursued to the full extent of the law," she said.

On immigration, she said people should stop blaming immigrants for problems like low wages and housing issues, earning her the first applause of the session.

First applause for Bennett is when she says society needs to stop blaming immigrants #AskTheLeaders

She also said people should show up to the polling station, even if only to register a protest vote.

The Labour Party: Ed Miliband

Miliband took part at midday. He began by fielding questions around Internet security for children and parental controls. "The Internet is a great thing, and the freedom of the Internet is a great thing, and we need to protect that," he said.

He then went on to talk about graduate unemployment, the need to move away from zero hours contracts, and his desire to invest in renewable technology.

Asked about the rise in "far right" parties by a member of the audience, he praised the UK's culture of "openness and tolerance" but warned "we've got to champion diversity, but make it work," citing the exploitation of migrant workers as an issue that needs to be addressed.

As expected, Miliband responded to Boots boss Stefano Pessina, who has said that a Labour government would "not be helpful for business". Miliband hit back, saying that Pessina doesn't pay his taxes in this country.

Ed Miliband hits back at comments made by Boots boss & says government isn't doing enough about tax avoidance http://t.co/CCjpsR4ANG

The first question to receive a round of applause was around the issue of radicalisation: "Would you agree that [UK] foreign policy is a factor in radicalisation?"

Miliband acknowledged that it was a factor and said that the Prevent counter-terrorism strategy should be run by community groups instead of the police.

The Liberal Democrats: Nick Clegg

Nick Clegg spoke at 2pm. He was asked if he would go into a coalition again.

"It's exactly like last time, it's not my choice or his choice or Ed Miliband's choice, it really is your choice," he said.

He answered questions about Trident and the NHS, saying that he would "work out how to keep people healthy in their own homes and communities so we do not have an increasing number of people going to A&E."

Clegg also tackled the issue of tuition fees. "More youngsters are now going to university than ever before, more youngsters from disadvantaged backgrounds are going to university than ever before, more youngsters from black and ethnic minority backgrounds are going to university than ever before," he insisted.

The Prime Minister fielded a range of questions on everything from the legalisation of drugs to VAT on sanitary products.

When asked if the voting age should be lowered to 16, he said no. He also defended the decision to fly flags at half mast following the death of Saudi Arabia's King Abdullah, saying there's a long-standing agreement.

One person attacked Prime Minister's Questions, referring to the weekly session as "horrible and petty", with ministers shouting at one another. Cameron explained it gets noisy in the Commons and MPs have to raise their voices to make themselves heard.

Cameron also said that badger culling was "probably the most unpopular [thing] for which I'm responsible."

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